Exhibit 10.18

EXHIBIT A

REGISTRATION RIGHTS AGREEMENT

This Registration Rights Agreement (this "Agreement") is made and entered into as of March 30, 2004, by and
among Sento Corporation, a Utah corporation (the "Company"), and the purchasers signatory hereto (each such purchaser, a
"Purchaser" and collectively, the "Purchasers").

This
Agreement is made pursuant to the Securities Purchase Agreement, dated as of the date hereof among the Company and the Purchasers (the "Purchase
Agreement").

The
Company and the Purchasers hereby agree as follows:

1.Definitions.Capitalized terms used and not otherwise defined herein that are defined in the Purchase
Agreement shall have the meanings given such terms in the Purchase Agreement. As used in this Agreement, the following terms shall have the following meanings:



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2.Registration.



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3.Registration Procedures

In
connection with the Company's registration obligations hereunder, the Company shall:



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4.Registration Expenses.All fees and expenses incident to the performance of or compliance with this Agreement
by the Company shall be borne by the Company whether or not any Registrable Securities are sold pursuant to the Registration Statement. The fees and expenses referred to in the foregoing sentence
shall include, without limitation, (i) all registration and filing fees (including, without limitation, fees and expenses (A) with respect to filings required to be made with the
Principal Market on which the Common Stock is then listed for trading, and (B) in compliance with applicable state securities or Blue Sky laws), (ii) printing expenses (including,
without limitation, expenses of printing certificates for Registrable Securities and of printing prospectuses if the printing of prospectuses is reasonably requested by the holders of a majority of
the Registrable Securities included

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in
the Registration Statement), (iii) messenger, telephone and delivery expenses, (iv) fees and disbursements of counsel for the Company, (v) Securities Act liability insurance,
if the Company so desires such insurance, and (vi) fees and expenses of all other Persons retained by the Company in connection with the consummation of the transactions contemplated by this
Agreement. In addition, the Company shall be responsible for all of its internal expenses incurred in connection with the consummation of the transactions contemplated by this Agreement (including,
without limitation, all salaries and expenses of its officers and employees performing legal or accounting duties), the expense of any annual audit and the fees and expenses incurred in connection
with the listing of the Registrable Securities on any securities exchange as required hereunder. In no event shall the Company be responsible for any broker or similar commissions or, except to the
extent provided for in the Transaction Documents, any legal fees or other costs of the Holders.

5.Indemnification



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6.Miscellaneous



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

| |  | SENTO CORPORATION
| |  | -----------------
| |  | By:              
| |  |                  
| |  |                  

[SIGNATURE PAGE OF HOLDERS FOLLOWS]

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[PURCHASER'S SIGNATURE PAGE TO SNTO RRA]

Name
of Investing Entity: Signature of Authorized Signatory of Investing entity:Name of Authorized Signatory:

Title of Authorized Signatory:

[SIGNATURE
PAGES CONTINUE]

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[PURCHASER'S SIGNATURE PAGE TO SNTO RRA]

Name
of Investing Entity: Signature of Authorized Signatory of Investing entity:Name of Authorized Signatory:

Title of Authorized Signatory:

[SIGNATURE
PAGES CONTINUE]

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ANNEX A

Plan of Distribution

The Selling Stockholders (the "Selling Stockholders") of the common stock ("Common
Stock") of Sento Corporation (the "Company") and any of their pledgees, assignees and
successors-in-interest may, from time to time, sell any or all of their shares of Common Stock on any stock exchange, market or trading facility on which the shares are traded
or in private transactions. These sales may be at fixed or negotiated prices. The Selling Stockholders may use any one or more of the following methods when selling shares:



The
Selling Stockholders may also sell shares under Rule 144 under the Securities Act of 1933, as amended (the "Securities Act"),
if available, rather than under this prospectus.

Broker-dealers
engaged by the Selling Stockholders may arrange for other brokers-dealers to participate in sales. Broker-dealers may receive commissions or discounts from the Selling
Stockholders (or, if any broker-dealer acts as agent for the purchaser of shares, from the purchaser) in amounts to be negotiated. Each Selling Stockholder does not expect these commissions and
discounts relating to its sales of shares to exceed what is customary in the types of transactions involved.

In
connection with the sale of our common stock or interests therein, the Selling Stockholders may enter into hedging transactions with broker-dealers or other financial institutions,
which may in turn engage in short sales of the common stock in the course of hedging the positions they assume. The Selling Stockholders may also sell shares of our common stock short and deliver
these securities to close out their short positions, or loan or pledge the common stock to broker-dealers that in turn may sell these securities. The Selling Stockholders may also enter into option or
other transactions with broker-dealers or other financial institutions or the creation of one or more derivative securities which require the delivery to such broker-dealer or other financial
institution of shares offered by this prospectus, which shares such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such
transaction).

The
Selling Stockholders and any broker-dealers or agents that are involved in selling the shares may be deemed to be "underwriters" within the meaning of the Securities Act in
connection with such sales. In such event, any commissions received by such broker-dealers or agents and any profit on the resale of the shares purchased by them may be deemed to be underwriting
commissions or discounts under the Securities Act. Each Selling Stockholder has informed the Company that it does not have

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any
agreement or understanding, directly or indirectly, with any person to distribute the Common Stock.

The
Company is required to pay certain fees and expenses incurred by the Company incident to the registration of the shares. The Company has agreed to indemnify the Selling Stockholders
against certain losses, claims, damages and liabilities, including liabilities under the Securities Act.

Because
Selling Stockholders may be deemed to be "underwriters" within the meaning of the Securities Act, they will be subject to the prospectus delivery requirements of the Securities
Act. In addition, any securities covered by this prospectus which qualify for sale pursuant to Rule 144 under the Securities Act may be sold under Rule 144 rather than under this
prospectus. Each Selling Stockholder has advised us that they have not entered into any agreements, understandings or arrangements with any underwriter or broker-dealer regarding the sale of the
resale shares. There is no underwriter or
coordinating broker acting in connection with the proposed sale of the resale shares by the Selling Stockholders.

We
agreed to keep this prospectus effective until the earlier of (i) the date on which the shares may be resold by the Selling Stockholders without registration and without regard
to any volume limitations by reason of Rule 144(e) under the Securities Act or any other rule of similar effect or (ii) all of the shares have been sold pursuant to the prospectus or
Rule 144 under the Securities Act or any other rule of similar effect. The resale shares will be sold only through registered or licensed brokers or dealers if required under applicable state
securities laws. In addition, in certain states, the resale shares may not be sold unless they have been registered or qualified for sale in the applicable state or an exemption from the registration
or qualification requirement is available and is complied with.

Under
applicable rules and regulations under the Exchange Act, any person engaged in the distribution of the resale shares may not simultaneously engage in market making activities with
respect to our common stock for a period of two business days prior to the commencement of the distribution. In addition, the Selling Stockholders will be subject to applicable provisions of the
Exchange Act and the rules and regulations thereunder, including Regulation M, which may limit the timing of purchases and sales of shares of our common stock by the Selling Stockholders or any
other person. We will make copies of this prospectus available to the Selling Stockholders and have informed them of the need to deliver a copy of this prospectus to each purchaser at or prior to the
time of the sale.

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Schedule 6(b)

Sento Corporation
Securities with Registration Rights

|                               |                         | Shares/
Issuable
Shares |         |               
|------------------------------ | ----------------------- | ----------------------- | ------- | --------------
|Debentures *                   |                         | 279,463                 |         |               
|Shares from warrant exercises: |                         |                         |         |               
|Cashless                       |                         | 18,928                  |         |               
|Fleming                        |                         | 2,500                   |         |               
|SVB                            |                         | 47,655                  |         |               
|Warrants outstanding:          |                         |                         |         | (Strike Price)
|                               | RCG                     |                         | 7,500   |               
|                               | RCG (April 02 issuance) |                         | 7,500   |               
|                               | 1999 Private Placement  |                         | 94,688  |               
|                               | Shareholder Relations   |                         | 20,000  |               
|                               | Bud Walker              |                         | 37,500  |               
|                               | Bud Walker              |                         | 12,500  |               
|                               | Debenture Warrants      |                         | 213,000 |               
|                               | Teitelbaum Warrants     |                         | 15,000  |               
|                               |                         |                         |         |               
|                               |                         | 756,234                 |         |               
|                               |                         |                         |         |               

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