Document:

Exhibit 10.13a

                             LIGHTSPACE CORPORATION

                 AMENDMENT NO. 1 TO UNIT SUBSCRIPTION AGREEMENT

     THIS AMENDMENT NO. 1, dated as of the 30th day of April,  2007 by and among
the  Investors  (as  defined  below)  who  have  signed  this  Amendment  1 (the
"Participating  Investors") and LIGHTSPACE  CORPORATION,  a Delaware corporation
(referred to herein as the "Company").

                              W I T N E S S E T H:

     WHEREAS, the parties wish to amend the Unit Subscription  Agreement,  dated
as of April 11, 2007 (the "Original Unit  Subscription  Agreement") by and among
the  Investors as defined  therein and the Company (as amended  hereby the "Unit
Subscription Agreement"),

     WHEREAS,  capitalized  terms not otherwise  defined in this Amendment shall
have the meaning set forth in the Original Unit Subscription Agreement,

     WHEREAS,  the Company  desires to sell to the Investors,  and the Investors
desire to purchase, up to six hundred thousand (600,000) Units, having the terms
set forth in the Original Subscription Agreement; and

     WHEREAS,  Griffin  Securities,  Inc. is  entitled to receive the  brokerage
commission identified in Section 3.2 in its capacity as financial advisor to the
Company.

     NOW THEREFORE, in consideration of the mutual promises, representations and
warranties  made  each  to  the  other,  it  is  hereby  agreed  that  the  Unit
Subscription Agreement is hereby amended and supplemented as follows:

         1. The Participating Investors hereby consent to the amendment of the
Original Unit Subscription Agreement pursuant to this Amendment.

     2. Section  1.1(a) of the Original  Unit  Subscription  Agreement is hereby
amended so as to be and read in its entirety as follows:

          "1.1. Sale and Issuance of Securities.

               (a) The Company  shall sell to the  Investors  and the  Investors
          shall purchase from the Company,  up to 600,000 Units,  at a price per
          Unit equal to $6.40. The Shares sold as part of the Units are referred
          to as the "Purchased Shares" and the Unit Warrants sold as part of the
          Units are referred to as the  "Purchased  Warrants"  and  collectively
          with the Purchased Shares, the "Securities"."

     3. The  Participating  Investors and the Company  hereby agree that Section
2.6 of the  Original  Unit  Subscription  Agreement  shall  be and  read  in its
entirety as follows:

               "2.6. Brokers and Finders.  Except for Griffin Securities,  Inc.,
          which  shall  receive  (i) a cash  commission  of 5% of the  aggregate
          Purchase  Price  of  the  Securities  and  (ii) a  five  year  warrant
          exercisable  to purchase at the Purchase Price a number of Units equal
          to 10% of the  number of Units sold  hereunder,  the  Company  has not
          retained any broker,  investment  banker or finder in connection  with
          the Contemplated Transactions."

<PAGE>

     4. The  Participating  Investors and the Company  hereby agree that Section
3.2 of the Unit  Subscription  Agreement  shall be and read in its  entirety  as
follows:

               "3.2.  Brokers and  Finders.  Investor has either not retained an
          investment  banker,  broker or finder,  or has  provided  the name and
          information  concerning  such entity to the Company on or prior to the
          applicable Closing Date."

     5. Except as explicitly  amended as set forth in this Amendment,  the terms
and  provisions of the Original Unit  Subscription  Agreement  shall continue in
full force and effect.  This Amendment  shall be effective when duly executed by
the Company and the Participating  Investors holding a majority of the Purchased
Shares.

     6. This  Amendment  may be  executed in one or more  counterparts,  each of
which shall be deemed an original  but all of which  shall  constitute  a single
instrument.

                [the balance of this page is intentionally blank]

                                     - 2 -
<PAGE>

                                 Signature Page
                                       to
       Lightspace Corporation Amendment No. 1, dated as of April 30, 2007
              to Unit Subscription Agreement, dated April 11, 2007

IN WITNESS WHEREOF, the undersigned have hereunto set their hands and seals on
the day and year first above written.

                                      THE COMPANY:

                                      LIGHTSPACE CORPORATION

                                      By:
                                         ---------------------------------------
                                      Name:
                                      Title:

                                      PARTICIPATING INVESTOR

                                      Date:

                                      By:
                                         ---------------------------------------
                                      Name:
                                      Title:

                                     - 3 -Exhibit 10.13b

                             LIGHTSPACE CORPORATION

                 AMENDMENT NO. 2 TO UNIT SUBSCRIPTION AGREEMENT

     THIS AMENDMENT NO. 2, dated as of the 30th day of April,  2007 by and among
the  Investors  (as  defined  below)  and  LIGHTSPACE  CORPORATION,  a  Delaware
corporation (referred to herein as the "Company").

                              W I T N E S S E T H:

     WHEREAS, the parties wish to amend the Unit Subscription  Agreement,  dated
as of April 11, 2007 (as amended, the "Original Unit Subscription Agreement") by
and among the  Investors as defined  therein and the Company (as amended  hereby
the "Unit Subscription Agreement");

     WHEREAS,  capitalized  terms not otherwise  defined in this Amendment shall
have the meaning set forth in the Original Unit Subscription Agreement; and

     WHEREAS,  as a condition of Closing under the Unit Subscription  Agreement,
the Company has agreed to a further covenant in favor of the Investors;

     NOW THEREFORE, in consideration of the mutual promises, representations and
warranties  made  each  to  the  other,  it  is  hereby  agreed  that  the  Unit
Subscription Agreement is hereby amended and supplemented as follows:

     1. The Company hereby agrees to amend Section 5.1 of the Unit  Subscription
Agreement so as to be and read in its entirety as follows:

     "The  Company  shall   cooperate  with  each  Investor  in  supplying  such
information as may be reasonably requested by such Investor to complete and file
any information  reporting forms presently or hereafter required by the SEC as a
condition to the  availability  of the safe harbor  pursuant to Rule 144 for the
sale of any of the Purchased  Shares,  the Purchased  Warrants,  the  Underlying
Securities and shares of capital stock of the Company received in respect of the
foregoing.  The Company  shall file with the SEC in a timely  manner all reports
and other documents as the Commission may prescribe under Section 13(a) or 15(d)
of the Exchange Act for a period of at least five years after the Closing."

     2. The Company has amended its Certificate of Incorporation to increase the
number of authorized shares of Common Stock to 75,000,000 shares.

     3. Except as explicitly  amended as set forth in this Amendment,  the terms
and  provisions of the Original Unit  Subscription  Agreement  shall continue in
full force and effect.  This Amendment  shall be effective when duly executed by
the Company.

                            [signature page follows]

<PAGE>

                                 Signature Page
                                       to
       Lightspace Corporation Amendment No. 2, dated as of April 30, 2007
              to Unit Subscription Agreement, dated April 11, 2007

IN WITNESS  WHEREOF,  the  undersigned  has  executed  this  Amendment 2 to Unit
Subscription Agreement on the day and year first above written.

                                                     THE COMPANY:

                                                     LIGHTSPACE CORPORATION

                                                     By:
                                                        ------------------------
                                                     Name:
                                                     Title:

                                     - 2 -Exhibit 10.14

                             LIGHTSPACE CORPORATION

                          REGISTRATION RIGHTS AGREEMENT

     REGISTRATION  RIGHTS  AGREEMENT  (this  "Agreement")  is entered into as of
April 2, 2007 by and among Lightspace  Corporation,  a Delaware corporation (the
"Company")  and the  investors  listed  on  Exhibit A hereto  (collectively  the
"Investors").

     WHEREAS,  the Company  desires to sell to the Investors,  and the Investors
desire to purchase,  up to a maximum of four hundred  thousand  (400,000)  Units
consisting of up to three  million two hundred  thousand  (3,200,000)  shares of
Common Stock of the Company (the  "Shares") and Unit Warrants (the  "Warrants"),
exercisable  to purchase up to four million eight hundred  thousand  (4,800,000)
shares of Common Stock of the Company (the "Warrant Shares"), upon the terms and
conditions set forth in that certain Unit  Subscription  Agreement,  dated as of
March 30,  2007,  among the Company and the  Investors  (the "Unit  Subscription
Agreement");

     WHEREAS, the terms of the Unit Subscription Agreement provide that it shall
be a condition  precedent to the closing of the transactions  thereunder for the
Company and the Investors to execute and deliver this Agreement; and

     WHEREAS,  capitalized  terms used  herein  and not  otherwise  defined  are
defined in the Unit Subscription Agreement.

     NOW,  THEREFORE,  in  consideration  of the premises  and mutual  covenants
contained herein, the parties hereto hereby agree as follows:

     1. Definitions. The following terms shall have the meanings provided below:

          "Additional  Shares" shall mean any additional  shares of Common Stock
which may be issued or  become  issuable  from time to time upon a  distribution
with respect to, or in exchange for, or in replacement of, Shares,  a Warrant or
Warrant  Shares,  as a  result  of  anti-dilution  provisions  of a  Warrant  or
otherwise.

          "Additional  Share Notice" shall have the meaning  assigned thereto in
Section 10 hereof.

          "Blue Sky" shall have the  meaning  assigned  thereto in Section  4(c)
hereof.

          "Board of Directors" shall mean the board of directors of the Company.

          "Convertible  Securities"  means (i)  options to purchase or rights to
subscribe for Common Stock,  (ii) securities by their terms  convertible into or
exchangeable  for  Common  Stock or (iii)  options  to  purchase  or  rights  to
subscribe for such convertible or exchangeable securities.

          "Correspondence"  shall have the meaning  assigned  thereto in Section
15(d) hereof.

<PAGE>

          "Difference"  shall have the meaning  assigned thereto in Section 8(b)
hereof.

          "Exchange  Act" shall mean the  Securities  Exchange  Act of 1934,  as
amended, and all of the rules and regulations promulgated thereunder.

          "Holder" shall mean each Investor or any transferee of the Warrants or
Registrable Shares that were held by Investors.

          "Majority  Holders"  shall mean,  at the  relevant  time of  reference
thereto,  those Holders holding more than fifty percent (50%) of the Registrable
Shares Owned by all of the Holders.

          "Mandatory  Registration"  shall have the meaning  assigned thereto in
Section 7 hereof.

          "Mandatory  Registration  Termination  Date"  shall  have the  meaning
assigned thereto in Section 3(c) hereof.

          "Other Registrable Securities" shall have the meaning assigned thereto
in Section 3(d) hereof.

          "Own" shall mean to own  beneficially,  as that term is defined in the
rules and regulations of the SEC.

          "Registrable Shares" shall mean the Shares, the Warrant Shares and any
Additional Shares.

          "Registration  Statement"  shall have the meaning  assigned thereto in
Section 3(a) hereof.

          "Rule 144" shall mean Rule 144  promulgated  under the  Securities Act
and any successor or substitute rule, law or provision.

          "SEC" shall mean the Securities and Exchange Commission.

          "Securities  Act" shall mean the  Securities  Act of 1933, as amended,
and all of the rules and regulations promulgated thereunder.

          "Selling  Expenses" shall mean all underwriting  discounts,  brokerage
and selling commissions applicable to the sale of Registrable Shares,  including
standard underwriters' cutbacks.

          "Shares"  shall have the meaning  assigned  thereto in the Preamble to
this Agreement.

          "Subsequent  Registration  Statements" shall have the meaning assigned
thereto in Section 3(e) hereof.

          "Suspension"  shall have the meaning assigned thereto in Section 10(b)
hereof.

                                       2
<PAGE>

          "Underlying  Securities"  shall mean the Warrant Shares and Additional
Shares issued or issuable upon exercise of Warrants.

          "Unit Subscription  Agreement" shall have the meaning assigned thereto
in the Preamble to this Agreement.

          "Warrants"  shall have the meaning assigned thereto in the Preamble to
this Agreement.

          "Warrant  Shares"  shall  have the  meaning  assigned  thereto  in the
Preamble to this Agreement.

     2. Effectiveness. This Agreement shall become effective upon the Closing.

     3. Mandatory Registration.

          (a) No later than forty five (45) days after the Closing,  the Company
will  prepare  and file with the SEC a  registration  statement  on Form S-1 (or
other appropriate form) for the purpose of registering (such  registration,  the
"Mandatory Registration") under the Securities Act all of the Registrable Shares
for resale by, and for the account  of, the  Investors  as selling  stockholders
thereunder (the  "Registration  Statement").  The  Registration  Statement shall
permit  the  Investors  to offer and  sell,  on a delayed  or  continuous  basis
pursuant to Rule 415 under the  Securities  Act,  any or all of the  Registrable
Shares.  Such  Registration  Statement also shall cover, to the extent allowable
under the Securities Act and the rules  promulgated  thereunder  (including Rule
416), such  indeterminate  number of additional shares of Common Stock resulting
from stock splits,  stock dividends or similar  transactions with respect to the
Registrable Shares.

          (b)  The  Company  agrees  to  use  its  best  efforts  to  cause  the
Registration Statement to become effective within ninety (90) days after filing.

          (c) The Company shall be required to keep the  Registration  Statement
(and any subsequent Registration Statements),  as amended,  effective until such
date that is the earlier of (i) two years after the Closing,  (ii) the date when
all of the  Registrable  Shares  registered  thereunder  shall have been sold or
(iii) such time as all the Registrable  Shares held by the Investors can be sold
pursuant  to  Rule  144(k)  and  without   compliance   with  the   registration
requirements  of the  Securities  Act (such  date is  referred  to herein as the
"Mandatory  Registration  Termination Date").  Thereafter,  the Company shall be
entitled to withdraw the Registration  Statement and the Investors shall have no
further  right to offer or sell any of the  Registrable  Shares  pursuant to the
Registration Statement (or any prospectus relating thereto).

          (d) Absent the prior  written  consent of the  Majority  Holders,  the
Company  shall not for a period of two years  from the  Closing  Date  grant any
registration  rights that are senior to the registration rights of the Investors
under this Agreement.  The Investors  acknowledge  that other holders of Company
securities have the right to include shares of Common Stock or other  securities
of  the  Company  (the  "Other  Registrable  Securities")  in  the  Registration
Statement.

                                       3
<PAGE>

          (e) In the event the amount of Shares and Underlying Shares covered by
such  Registration  Statement  is limited  by the SEC,  the  Company:  (i) shall
register  the  maximum  number  of  Registrable  Shares  and  Other  Registrable
Securities  permitted by the SEC, allocated among the Holders and the holders of
Other Registrable  Securities in proportion to the amount previously included in
the  Registration  Statement,   and  (ii)  shall  file  additional  registration
statements (the "Subsequent  Registration  Statements")  covering the balance of
the Registrable  Shares and Other Registrable  Securities as soon as practicable
in light of SEC positions, rules and regulations. The Company shall use its best
efforts  to cause  any and all  Subsequent  Registration  Statements  to  become
effective within seventy five (75) days after each such filing.

     4. Obligations of the Company. In connection with the Company's obligations
under Section 3 hereof to file the  Registration  Statement  with the SEC and to
use its  reasonable  efforts  to cause  the  Registration  Statement  to  become
effective as soon as set forth in Section 3, the Company shall, as expeditiously
as reasonably possible, subject to Section 10 hereof:

          (a) prepare and file with the SEC such  amendments and  supplements to
the  Registration  Statement and the prospectus used in connection  therewith as
may be necessary in order to keep the Registration Statement effective until the
Mandatory Registration Termination Date;

          (b) furnish to the selling Holders such reasonable number of copies of
the  Registration  Statement  and a final  prospectus,  in  conformity  with the
requirements of the Securities Act, and such other documents (including, without
limitation, prospectus amendments and supplements as are prepared by the Company
in  accordance  with Section 4(a) above) as the selling  Holders may  reasonably
request,  in order to facilitate the public or other disposition of such selling
Holders' Registrable Shares;

          (c) use  reasonable  efforts to register  and qualify the  Registrable
Shares covered by the Registration Statement under such other securities laws or
blue sky ("Blue Sky") laws of all states  requiring such  securities or Blue Sky
registration or  qualification,  provided that the Company shall not be required
in connection  therewith or as a condition  thereto to qualify to do business or
to  file a  general  consent  to  service  of  process  in any  such  states  or
jurisdictions; and

          (d) use  reasonable  efforts  to  cause  all such  Registrable  Shares
registered hereunder to be listed on each securities exchange (including without
limitation  The Nasdaq  SmallCap  Market) on which  securities of the same class
issued by the Company are then listed.

     5. Furnish Information.

          (a) It  shall  be a  condition  precedent  to the  obligations  of the
Company to take any action  pursuant to this Agreement that the selling  Holders
shall furnish to the Company such information  regarding them and the securities
held by them as the Company shall reasonably request and as shall be required in
order to effect any registration by the Company pursuant to this Agreement.

                                       4
<PAGE>

          (b) The Registration Statement will provide for a plan of distribution
with respect to the Registrable Shares  substantially as follows,  provided such
plan of distribution  may be modified at the request of the SEC: The Registrable
Shares may be sold from time to time by the  Holders,  or by  pledgees,  donees,
transferees  or other  successors in interest.  Such sales may be made on one or
more exchanges or in the over-the-counter  market, or otherwise at prices and at
terms then prevailing or at prices related to the then-current  market price, or
in negotiated transactions. The Registrable Shares may be sold by one or more of
the  following:  (i) a block trade in which the broker or dealer so engaged will
attempt to sell the shares as agent but may position and resell a portion of the
block as principal to facilitate the transaction;  (ii) purchases by a broker or
dealer as principal and resale by such broker or dealer for its account pursuant
to  the  resale  registration  statement;  (iii)  an  exchange  distribution  in
accordance  with the  rules  of such  exchange;  (iv)  one or more  underwritten
offerings on a firm  commitment or best efforts  basis;  (v) ordinary  brokerage
transactions and transactions in which the broker solicits purchasers;  and (vi)
transactions  between  sellers  and  purchasers  without  a  broker/dealer.   In
addition,  any securities covered by the Registration Statement that qualify for
sale pursuant to Rule 144 may be sold under Rule 144 rather than pursuant to the
Registration  Statement.  For so long as a Holder Owns any  Registrable  Shares,
such  Holder  shall not  maintain a Net Short  Position.  For  purposes  of this
Section, a "Net Short Position" by a person means a position whereby such person
has  executed  one or more sales of Common  Stock that is marked as a short sale
and that is  executed at a time when such  Holder has no  equivalent  offsetting
long position in the Common Stock. For purposes of determining  whether a Holder
has an equivalent offsetting long position in the Common Stock, all Common Stock
that is Owned by such Holder shall be deemed to be held long by such Holder. The
Holders  may also  distribute  the  Registrable  Shares  and  Warrants  to their
partners, members, stockholders or shareholders to the extent such distributions
are effected in full  compliance  with  applicable  securities laws and provided
that the distributing Holders and the distributees provide the Company with such
documents  and other  information  as  reasonably  requested by the Company.  In
effecting  sales,  brokers or dealers engaged by the selling Holders may arrange
for other  brokers or dealers to  participate.  Brokers or dealers  will receive
commissions  or  discounts  from  selling  Holders in  amounts to be  negotiated
immediately prior to the sale.

     6. Expenses of Registration.  All expenses  incurred in connection with the
registration  of the Registrable  Shares  pursuant to this Agreement,  including
without limitation all registration and qualification and filing fees,  printing
expenses,  fees and disbursements of counsel for the Company,  shall be borne by
the Company. The Company shall not be responsible for the fees and disbursements
of counsel for any of the selling  Holders.  All Selling Expenses shall be borne
by the Holders of the Registrable Shares so registered and sold, pro rata on the
basis of the number of their Registrable Shares so registered and sold.

     7. Indemnification.

                                       5
<PAGE>

          (a) To the extent  permitted by law, the Company  will  indemnify  and
hold harmless each selling Holder (including the partners or officers, directors
and  stockholders  of such Holder),  and each person,  if any, who controls such
selling  Holder within the meaning of the  Securities  Act,  against any losses,
claims,  damages  or  liabilities,  joint or  several,  to which they may become
subject under the  Securities  Act, the Exchange Act, and other federal or state
securities  laws,  or  otherwise,  insofar as such  losses,  claims,  damages or
liabilities  (or actions in respect  thereof) (i) arise out of or are based upon
any untrue or alleged  untrue  statement of any material  fact  contained in the
Registration  Statement,  in any  preliminary  prospectus  or  final  prospectus
relating  thereto  or in any  amendments  or  supplements  to  the  Registration
Statement or any such preliminary prospectus or final prospectus, (ii) arise out
of or are  based  upon the  omission  or  alleged  omission  to state  therein a
material fact required to be stated therein, or necessary to make the statements
therein not misleading or (iii) arise out of any violation or alleged  violation
by the Company of the  Securities  Act, the Exchange  Act, any other  federal or
state securities law or any rule or regulation  promulgated under the Securities
Act,  the Exchange Act or any other  federal or state  securities  law; and will
reimburse such selling Holder, or such officer,  director or controlling  person
for any legal or other expenses  reasonably  incurred by them in connection with
investigating or defending any such loss,  claim,  damage,  liability or action;
provided,  however,  that the indemnity agreement contained in this Section 7(a)
shall not apply to amounts paid in settlement of any such loss,  claim,  damage,
liability or action if such  settlement  is effected  without the consent of the
Company (which consent shall not be unreasonably withheld or delayed), nor shall
the Company be liable in any such case for any such loss,  damage,  liability or
action, to the extent that it arises out of or is based upon an untrue statement
or alleged untrue statement or omission made in connection with the Registration
Statement,  any preliminary  prospectus or final prospectus  relating thereto or
any  amendments  or  supplements  to the  Registration  Statement  or  any  such
preliminary  prospectus or final prospectus,  in reliance upon and in conformity
with written  information  furnished  expressly for use in  connection  with the
Registration Statement or any such preliminary prospectus or final prospectus by
the selling  Holders,  any  broker/dealer  acting on their behalf or controlling
person with respect to them.

          (b) To the extent permitted by law, each selling Holder will severally
and not jointly indemnify and hold harmless the Company,  each of its directors,
each of its officers who have signed the Registration Statement, each person, if
any, who controls the Company within the meaning of the  Securities  Act, or any
selling  Holders,  and all other  selling  Holders  against any losses,  claims,
damages  or  liabilities  to which the  Company or any such  director,  officer,
controlling person or such other selling Holder may become subject to, under the
Securities  Act or  otherwise,  insofar  as  such  losses,  claims,  damages  or
liabilities  (or actions in respect  thereto) arise out of or are based upon any
untrue or  alleged  untrue  statement  of any  material  fact  contained  in the
Registration  Statement  or any  preliminary  prospectus  or  final  prospectus,
relating  thereto  or in any  amendments  or  supplements  to  the  Registration
Statement or any such preliminary  prospectus or final prospectus,  or arise out
of or are  based  upon the  omission  or  alleged  omission  to state  therein a
material fact required to be stated  therein or necessary to make the statements
therein not  misleading,  in each case to the extent and only to the extent that
such  untrue  statement  or alleged  untrue  statement  or  omission  or alleged
omission was made in the Registration  Statement,  in any preliminary prospectus
or final prospectus  relating thereto or in any amendments or supplements to the
Registration  Statement or any such preliminary  prospectus or final prospectus,
in reliance upon and in  conformity  with written  information  furnished by the
selling Holder expressly for use in connection with the Registration  Statement,
or any preliminary prospectus or final prospectus;  and such selling Holder will
reimburse any legal or other expenses  reasonably incurred by the Company or any
such  director,  officer,   controlling  person,  or  other  selling  Holder  in
connection  with  investigating  or  defending  any such  loss,  claim,  damage,
liability  or action;  provided,  however,  that the  liability  of each selling
Holder hereunder (when aggregated with amounts contributed,  if any, pursuant to
Section 7(d)) shall be limited to the difference (the "Difference")  between (a)
the amount  received  by such  Holder  from the sale of the  Registrable  Shares
pursuant to the Registration Statement and (b) the amount paid by such Holder to
the  Company  for such  Registrable  Shares  pursuant  to the Unit  Subscription
Agreement; and provided, further, that the indemnity agreement contained in this
Section  7(b) shall not apply to amounts  paid in  settlement  of any such loss,
claim,  damage,  liability or action if such settlement is effected  without the
consent of those  selling  Holder(s)  against which the request for indemnity is
being made (which consent shall not be unreasonably withheld or delayed).

                                       6
<PAGE>

          (c) Promptly after receipt by an indemnified  party under this Section
7 of notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against any indemnifying party under this
Section 7, notify the indemnifying party in writing of the commencement  thereof
and the  indemnifying  party shall have the right to  participate in and, to the
extent the indemnifying party desires, jointly with any other indemnifying party
similarly  noticed,  to assume at its expense the defense  thereof  with counsel
mutually  satisfactory  to the  indemnifying  parties  with the  consent  of the
indemnified party, which consent will not be unreasonably withheld,  conditioned
or delayed.  In the event that the indemnifying  party assumes any such defense,
the  indemnified  party may participate in such defense with its own counsel and
at its own expense,  provided,  however,  that the counsel for the  indemnifying
party shall act as lead  counsel in all matters  pertaining  to such  defense or
settlement  of such  claim and the  indemnifying  party  shall only pay for such
indemnified  party's  reasonable legal fees and expenses for the period prior to
the date of its participation in such defense,  and provided  further,  however,
that the indemnified  party (together with all indemnified  parties which may be
represented  without conflict by one counsel) shall have the right to retain one
separate counsel, with the reasonable fees and expenses of such separate counsel
to be paid by the indemnifying  party, if the  representation of the indemnified
party by the counsel retained by the  indemnifying  party would be inappropriate
due to actual or potential differing interests between the indemnified party and
any other party represented by such counsel in such proceeding.  Notwithstanding
the foregoing,  the indemnifying party shall not be obligated to pay the fees of
more than one separate counsel.  The failure to notify an indemnifying  party of
the commencement of any such action will not relieve such indemnifying  party of
any  liability  to the  indemnified  party  under this  Section 7 (except to the
extent that such  failure  materially  and  adversely  affects the  indemnifying
party's  ability to defend such action),  nor shall the omission so to notify an
indemnifying party relieve such indemnifying party of any liability which it may
have to any  indemnified  party  otherwise  other than under this  Section 7. No
indemnifying party shall,  without the consent of the indemnified party, consent
to entry of any judgment or enter into any settlement  which does not include as
an  unconditional  term  thereof the giving by the claimant or plaintiff to such
indemnified  party of a release  from all  liability in respect to such claim or
litigation and otherwise in form and substance  reasonably  satisfactory  to the
indemnified party.

          (d) If the  indemnification  provided  in this  Section 7 is held by a
court of competent  jurisdiction to be unavailable to an indemnified  party with
respect to any loss,  liability,  claim,  damage or expense  referred to herein,
then the  indemnifying  party, in lieu of indemnifying  such  indemnified  party
hereunder,  shall  contribute to the amount paid or payable by such  indemnified
party as a result of such  loss,  liability,  claim,  damage or  expense in such
proportion as is appropriate  to reflect the relative fault of the  indemnifying
party on the one hand and of the  indemnified  party on the other in  connection
with the  statements  or  omissions  that  shall  have  resulted  in such  loss,
liability,  claim,  damage or expense,  as well as any other relevant  equitable
considerations;  provided that in no event shall any  contribution  by an Holder
under this Section 7(d), when aggregated with amounts paid, if any,  pursuant to
Section 7(b),  exceed the  Difference.  The relative  fault of the  indemnifying
party and of the  indemnified  party shall be  determined by reference to, among
other things,  whether the untrue or alleged untrue statement of a material fact
or the omission to state a material fact relates to information  supplied by the
indemnifying party or by the indemnified party and the parties' relative intent,
knowledge,  access to  information,  and  opportunity to correct or prevent such
statement or omission.

                                       7
<PAGE>

          (e) The  obligations  of the Company and Holders  under this Section 7
shall  survive  the  completion  of any  offering  of  Registrable  Shares  in a
Registration Statement under Section 3 and otherwise.

     8. Reports Under the Exchange  Act. With a view to making  available to the
Holders  the  benefits of Rule 144 and any other rule or  regulation  of the SEC
that may at any time  permit the Holders to sell the  Registrable  Shares to the
public without  registration,  the Company agrees to use reasonable efforts: (a)
to make and keep public information available, as those terms are understood and
defined in Rule 144, (b) to file with the SEC in a timely manner all reports and
other documents required to be filed by an issuer of securities registered under
the Securities Act or the Exchange Act and (c) undertake any additional  actions
reasonably necessary to maintain the effectiveness of the Registration Statement
or the use of Rule 144.

     9.  Selling  Procedures.  Any  sale of  Registrable  Shares  pursuant  to a
registration  statement  filed in  accordance  with  Section  3 hereof  shall be
subject to the following conditions and procedures:

          (a) Updating the Prospectus.

            (i) If the Company informs the selling Holder that any  registration
statement or final prospectus covering  Registrable Shares then on file with the
SEC is not current or  otherwise  does not comply with the  Securities  Act, the
Company shall use its commercially  reasonable efforts to provide to the selling
Holder a current  prospectus  that complies with the  Securities  Act as soon as
practicable, but in no event later than five (5) business days after delivery of
such notice.

            (ii) If the Company  requires  more than five (5)  business  days to
update the prospectus  under Section  10(a)(i) above, the Company shall have the
right to delay the  preparation of a current  prospectus  that complies with the
Securities Act without  explanation to such Holder,  subject to the  limitations
set forth in Section  10(b)  below,  for a total of not more than two periods of
thirty (30) days each during any twelve-month period.

                                       8
<PAGE>

          (b) General. Notwithstanding the foregoing, upon receipt of any notice
from the  Company of (i) any  request  by the SEC or any other  federal or state
governmental  authority  during the period of  effectiveness of the Registration
Statement for amendments or supplements to the Registration Statement or related
prospectus or for additional information relating to the Registration Statement,
(ii)  the  issuance  by the  SEC or any  other  federal  or  state  governmental
authority of any stop order  suspending the  effectiveness  of the  Registration
Statement or the  initiation  of any  proceedings  for that  purpose,  (iii) the
receipt by the Company of any notification with respect to the suspension of the
qualification or exemption from  qualification of any of the Registrable  Shares
for sale in any  jurisdiction or the initiation or threatening of any proceeding
for such purpose, (iv) the happening of any event which makes any statement made
in the registration  statement covering Registrable Shares or related prospectus
or any document  incorporated or deemed to be incorporated  therein by reference
untrue in any  material  respect or which  requires the making of any changes in
the  registration   statement  or  prospectus  so  that,  in  the  case  of  the
registration  statement,  it will not contain an untrue  statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make  the  statements  therein  not  misleading,  and that in the case of the
prospectus,  it will not contain an untrue  statement of a material fact or omit
to state a material fact necessary in order to make the statements  therein,  in
the light of the circumstances under which they were made, not misleading or (v)
that, in the judgment of the Board of Directors,  it is advisable to suspend use
of the  prospectus  for a  discrete  period  of time  due to  pending  corporate
developments,  public  filings  with  the  SEC or  that  there  exists  material
nonpublic  information about the Company that the Board of Directors,  acting in
good faith,  determines  not to disclose in a registration  statement,  then the
Company may suspend use of the prospectus (each a  "Suspension"),  in which case
the Company  shall  promptly  so notify  each  Holder and each Holder  shall not
dispose  of  Registrable  Shares  covered  by  the  registration   statement  or
prospectus until copies of a supplemented or amended  prospectus are distributed
to the Holders or until the  Holders are advised in writing by the Company  that
the use of the applicable prospectus may be resumed;  provided,  however,  that,
notwithstanding  the  foregoing,  the Company may suspend use of the  prospectus
pursuant to Sections  10(a)(ii),  10(b)(iv) and  10(b)(v),  and an Holder may be
prohibited from selling or otherwise disposing of the Registrable Shares covered
by the  registration  statement or  prospectus,  for no more than two periods of
thirty (30) days during any such twelve-month  period. The Company shall use its
best  efforts  to ensure  the use of the  prospectus  may be  resumed as soon as
practicable.  The Company shall use its best efforts to obtain the withdrawal of
any order suspending the  effectiveness of the  registration  statement,  or the
lifting of any suspension of the qualification (or exemption from qualification)
of any  of  the  securities  for  sale  in  any  jurisdiction,  at the  earliest
practicable  moment.  The  Company  shall,  upon  the  occurrence  of any  event
contemplated by clause (iv), prepare a supplement or post-effective amendment to
the  registration  statement or a supplement  to the related  prospectus  or any
document  incorporated  therein by reference or file any other required document
so that, as thereafter  delivered to the  purchasers of the  Registrable  Shares
being sold thereunder, such prospectus will not contain an untrue statement of a
material fact or omit to state a material fact  necessary to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.

     10. Issuance of Certain Securities.  Until all Registrable Shares have been
resold publicly pursuant to a registration  statement or under Rule 144, without
the prior  written  consent of  Majority  Holders,  during the three year period
following  the  Closing  Date,  the  Company  shall  not  issue for cash (a) any
Convertible  Securities  or similar  securities  that  contain a provision  that
provides for any change or  determination  of the applicable  conversion  price,
conversion  rate, or exercise price (or a similar  provision  which might have a
similar effect) based on any determination of the market price or other value of
the Company's securities or any other market based or contingent standard,  such
as  so-called  "toxic"  or  "death  spiral"  convertible  securities;  provided,
however,  that this  prohibition  shall not include  Convertible  Securities  or
similar  securities the conversion or exercise price or conversion rate of which
is (i) fixed on the date of issuance,  (ii) subject to adjustment as a result of
or in connection with a bona fide business combination or similar transaction or
(iii) subject to adjustment based upon the issuance by the Company of additional
securities,  including without  limitation,  standard  anti-dilution  adjustment
provisions which are not based on calculations of market price or other variable
valuations;  and  provided,  further,  that in no event shall this  provision be
deemed  to  prohibit  the  transactions  contemplated  in the Unit  Subscription
Agreement, or (b) any preferred stock, debt instruments or similar securities or
investment   instruments   provided  for  (i)   preferences  or  other  payments
substantially in excess of the original investment by purchasers thereof or (ii)
dividends,  interest  or similar  payments  other than  dividends,  interest  or
similar  payments  computed  on an annual  basis and not in excess,  directly or
indirectly,  of the lesser of a rate equal to (A) twice the interest  rate on 10
year US Treasury Notes and (B) 20%.

                                       9
<PAGE>

     11.  Assignment.  This  Agreement  shall be  binding  upon and inure to the
benefit  of and be  enforceable  by the  parties  hereto  and  their  respective
successors and assigns.  In addition,  and whether or not any express assignment
shall have been made, the provisions of this Agreement which are for the benefit
of the  Holders  shall  also  be for  the  benefit  of  and  enforceable  by any
subsequent  holder of any  Registrable  Shares  who has  executed a copy of this
Agreement or otherwise  indicated  its  agreement  to be bound  hereby.  Without
limitation on the Holders' rights to transfer  Registrable  Shares,  the Company
acknowledges  that any Holder may, at any time,  transfer any of the Registrable
Shares which it may own, beneficially or of record, to (a) its affiliates or (b)
its partner(s), investor(s), security holder(s) or beneficial holder(s) pursuant
to  its  organization  documents  or  other  agreements,   and  that,  upon  the
consummation  of any such transfer,  the  provisions of this Agreement  shall be
binding  upon and inure to the benefit of each  transferee  of such  Registrable
Shares.

     12. Entire Agreement.  This Agreement  (including the exhibits hereto), the
Unit Subscription  Agreement and the Warrants  constitute and contain the entire
agreement and  understanding  of the parties with respect to the subject  matter
hereof,  and such  agreements  also  supersede  any and all prior  negotiations,
correspondence,  agreements or understandings with respect to the subject matter
hereof.

     13. Miscellaneous.

          (a)  Amendments.  This  Agreement  may  not be  amended,  modified  or
terminated,  and no rights or provisions may be waived,  except with the written
consent of the Majority Holders and the Company.

          (b) Governing Law. This  Agreement  shall be governed by and construed
and enforced in  accordance  with the laws of the State of New York.  Each party
hereby  irrevocably  consents  and submits to the  jurisdiction  of any New York
State or United States Federal Court sitting in the State of New York, County of
New York,  over any action or  proceeding  arising  out of or  relating  to this
Agreement and irrevocably  consents to the service of any and all process in any
such action or  proceeding  by  registered  mail  addressed to such party at its
address  specified  herein (or as otherwise  noticed to the other  party).  Each
party further  waives any objection to venue in New York and any objection to an
action  or  proceeding  in such  state  and  county  on the  basis of forum  non
conveniens. Each party also waives any right to trial by jury.

                                       10
<PAGE>

          (c) Successors and Assigns.  This Agreement  shall be binding upon and
inure to the benefit of the parties hereto and their respective heirs,  personal
representatives,  successors or assigns.  This  Agreement  shall also be binding
upon and  inure  to the  benefit  of any  transferee  of any of the  Registrable
Shares.  Notwithstanding  anything in this Agreement to the contrary,  if at any
time any Holder shall cease to own any Registrable  Shares, all of such Holder's
rights under this Agreement shall immediately terminate.

          (d) Notices.

            (i)  Any  notices,  reports  or  other  correspondence  (hereinafter
collectively referred to as "correspondence")  required or permitted to be given
hereunder shall be given in writing and shall be deemed  effectively  given upon
(a) personal delivery, (b) delivery by fax (with answer back confirmed),  or (c)
two business days after mailing by recognized overnight courier (such as Federal
Express), addressed to a party at its address or sent to the fax number provided
below or at such other  address or fax  number as such  party may  designate  by
three days' advance notice to the other party.

            (ii)  All  correspondence  to the  Company  shall  be  addressed  as
follows:

                  Lightspace Corporation
                  Boston, MA 02129
                  Attention:       CEO
                  Fax Number:

                  with a copy to:

                  Hahn & Hessen LLP
                  488 Madison Avenue
                  New York, NY 10022
                  Fax: 212-478-7400
                  Attention: James Kardon

            (iii) All  correspondence  to any  Holder  shall be sent to the most
recent address furnished by the Holder to the Company.

            (iv) Any Holder may change the address to which correspondence to it
is to be addressed by notification as provided for herein.

          (e) Injunctive Relief.  The parties  acknowledge and agree that in the
event of any breach of this  Agreement,  remedies at law may be inadequate,  and
each of the parties hereto shall be entitled to seek specific performance of the
obligations of the other parties hereto and such appropriate  injunctive  relief
as may be granted by a court of competent jurisdiction.

          (f) Attorney's Fees. If any action at law or in equity is necessary to
enforce or interpret any of the terms of this  Agreement,  the prevailing  party
shall  be  entitled  to  reasonable   attorneys'   fees,   costs  and  necessary
disbursements  in  addition  to any  other  relief  to which  such  party may be
entitled.

                                       11
<PAGE>

          (g)  Severability.  If any  provision  of this  Agreement is held by a
court of competent  jurisdiction to be unenforceable  under applicable law, such
provision  shall be replaced with a provision that  accomplishes,  to the extent
possible,  the  original  business  purpose  of such  provision  in a valid  and
enforceable  manner, and the balance of the Agreement shall be interpreted as if
such provision were so modified and shall be enforceable in accordance  with its
terms.

          (h)  Aggregation  of Shares.  Registrable  Shares  held or acquired by
affiliated   entities  or  persons  shall  be  aggregated  for  the  purpose  of
determining the availability of any rights under this Agreement.

          (i)  Counterparts.  This  Agreement  may be  executed  in a number  of
counterparts,  any of which  together  shall  for all  purposes  constitute  one
Agreement,  binding  on all the  parties  hereto  notwithstanding  that all such
parties have not signed the same counterpart.

          (j) Conflicts. The Company and each Investor (i) acknowledge that Hahn
& Hessen LLP,  counsel to the Company in connection  with this Agreement and the
Unit Subscription Agreement,  has acted, and from time to time continues to act,
as counsel to (A) certain Investors,  or affiliates  thereof,  including without
limitation AIGH Investment Partners,  LLC, in connection with investments in the
Company,  and in unrelated  matters,  (ii) consent to the  representation of the
Company and such other  representation of the Investors,  or affiliates thereof,
by Hahn & Hessen LLP, (iii) acknowledge that a partner of Hahn & Hessen LLP Owns
securities of the Company  constituting  less than 0.05% of outstanding stock of
the Company, and (iv) waive any conflicts of interest claim which may arise from
any or all of the foregoing.

                                       12
<PAGE>

                    SIGNATURE PAGE TO LIGHTSPACE CORPORATION
                          REGISTRATION RIGHTS AGREEMENT

     IN WITNESS  WHEREOF,  the parties  hereto have executed  this  Registration
Rights Agreement as of the date and year first above written.

                                                     LIGHTSPACE CORPORATION

                                                     By:
                                                        ------------------------
                                                     Name:
                                                          ----------------------
                                                     Title:
                                                           ---------------------

                                                     INVESTORS:

                                                     (Individuals)

                                                     ---------------------------
                                                     Name:

                                                     (Entities)

                                                     Entity Name:

                                                     By:
                                                        ------------------------
                                                     Name:
                                                          ----------------------
                                                     Title:
                                                           ---------------------

<PAGE>

                                    Exhibit A

                              SCHEDULE OF INVESTORS

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