Document:

Secured Promissory Note

 Exhibit 10.1 
  
 THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS
OF ANY STATE, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN
OPINION OF COUNSEL IN A FORM SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE APPLICABLE SECURITIES LAWS OF ANY STATE. 
  
 SECURED PROMISSORY NOTE 
  

			
	 $700,000.00
	 	March 11, 2005
	 	 	Clearwater, Florida

  
 For value received,
Digital Lightwave, Inc., a Delaware corporation (the “Company”), promises to pay to Optel Capital, LLC, a Delaware limited liability company (the “Holder”), or its registered assigns, the principal sum of Seven
Hundred Thousand Dollars ($700,000.00). Interest shall accrue from the date of this Note on the unpaid principal amount at a rate equal to 10.0% per annum, compounded annually. The interest rate shall be computed on the basis of the actual number of
days elapsed and a year of 360 days. This Note is subject to the following terms and conditions. 
  
 1. Maturity. 
  
 (a) Principal and any accrued but unpaid interest under this Note shall be due and payable upon demand by the Holder at any time after May 31, 2005.

  
 (b) Notwithstanding the foregoing, the entire unpaid principal
sum of this Note, together with accrued and unpaid interest thereon, shall become immediately due and payable upon demand by the Holder at any time on or following the occurrence of any of the following events: 
  
 (i) the sale of all or substantially all of the Company’s assets, or
any merger or consolidation of the Company with or into another corporation; other than a merger or consolidation in which the holders of more than 50% of the shares of capital stock of the Company outstanding immediately prior to such transaction
continue to hold (either by the voting securities remaining outstanding or by their being converted into voting securities of the surviving entity) more than 50% of the total voting power represented by the voting securities of the Company, or such
surviving entity, outstanding immediately after such transaction; 
  
 (ii) the inability of the Company to pay its debts as they become due; 

 (iii) the dissolution, termination of existence, or appointment of a receiver, trustee or custodian, for
all or any material part of the property of, assignment for the benefit of creditors by, or the commencement of any proceeding by the Company under any reorganization, bankruptcy, arrangement, dissolution or liquidation law or statute of any
jurisdiction, now or in the future in effect; 
  
 (iv) the
execution by the Company of a general assignment for the benefit of creditors; 
  
 (v) the commencement of any proceeding against the Company under any reorganization, bankruptcy, arrangement, dissolution or liquidation law or statute of any jurisdiction, now or in the future in effect, which is not
cured by the dismissal thereof within ninety (90) days after the date commenced; or 
  
 (vi) the appointment of a receiver or trustee to take possession of the property or assets of the Company. 
  
 2. Payment; Prepayment. All payments shall be made in lawful money of the United States of America at such place as the Holder hereof may
from time to time designate in writing to the Company. Payment shall be credited first to the accrued interest then due and payable and the remainder applied to principal. Prepayment of this Note may be made at any time without penalty. 

 
 3. Transfer; Successors and Assigns. The terms and
conditions of this Note shall inure to the benefit of and be binding upon the respective successors and assigns of the parties. This Note may be transferred only upon surrender of the original Note for registration of transfer, duly endorsed,
or accompanied by a duly executed written instrument of transfer in form satisfactory to the Company. Thereupon, a new note for the same principal amount and accrued interest will be issued to, and registered in the name of, the transferee. Interest
and principal are payable only to the registered holder of this Note. 
  
 4. Governing Law. This Note and all acts and transactions pursuant hereto and the rights and obligations of the parties hereto shall be governed, construed and interpreted in accordance with the laws of the State of Florida,
without giving effect to principles of conflicts of law. 
  
 5.
Notices. Any notice required or permitted by this Agreement shall be in writing and shall be deemed sufficient upon receipt, when delivered personally or by courier, overnight delivery service or confirmed facsimile, or 48 hours after
being deposited in the U.S. mail as certified or registered mail with postage prepaid, if such notice is addressed to the party to be notified at such party’s address or facsimile number as set forth below or as subsequently modified by written
notice. 
  
 6. Amendments and Waivers. Any term of
this Note may be amended only with the written consent of the Company and the Holder. Any amendment or waiver effected in accordance with this Section 6 shall be binding upon the Company, each Holder and each transferee of this Note.

  

 -2- 

 7. Officers and Directors Not Liable. In no event shall any officer or director of the
Company be liable for any amounts due or payable pursuant to this Note. 
  
 8. Security Interest. This Note is secured by all of the assets of the Company in accordance with the Twenty Second Amended and Restated Security Agreement by and between the Company and the Holder dated as of September 16,
2004 (the “Security Agreement”). In case of an Event of Default (as defined in the Security Agreement), the Holder shall have the rights set forth in the Security Agreement. 
  
 9. Counterparts. This Note may be executed in any number of
counterparts, each of which will be deemed to be an original and all of which together will constitute a single agreement. 
  
 10. Action to Collect on Note. If action is instituted to collect on this Note, the Company promises to pay all costs and expenses,
including reasonable attorney’s fees, incurred in connection with such action. 
  
 11. Loss of Note. Upon receipt by the Company of evidence satisfactory to it of the loss, theft, destruction or mutilation of this Note or any Note exchanged for it, and indemnity satisfactory to the
Company (in case of loss, theft or destruction) or surrender and cancellation of such Note (in the case of mutilation), the Company will make and deliver in lieu of such Note a new Note of like tenor. 
  
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 -3- 

 This Note was entered into as of the date set forth above. 
  

			
	 COMPANY:
  

	DIGITAL LIGHTWAVE, INC.
		
	 By:
	 	 /s/ ROBERT F. HUSSEY

	 	 	 Robert F. Hussey

	 	 	 Interim President and Chief Executive Officer

 AGREED TO AND ACCEPTED: 
  
 OPTEL CAPITAL, LLC 
  

			
	 By:
	 	 /s/ PAUL RAGAINI

	 Name:
	 	 Paul Ragaini

	 Title:
	 	 Chief Financial OfficerForm of Employment Agreement

 Exhibit 10.1 
  
 VIROPHARMA INCORPORATED 
  
 EMPLOYEE INVENTION AND NON-DISCLOSURE AGREEMENT 
  
 This Agreement is made on [date], 2005 by EMPLOYEE (“Employee”) in favor of ViroPharma Incorporated
(“Employer”). 
  
 Employee’s execution of this
Agreement is a prerequisite to Employer’s employment of Employee. In consideration of Employer’s employment of Employee, the parties, intending to be legally bound, hereby agrees as follows: 
  
 1. Employee shall record descriptions of all of Employee’s work in the manner directed
by Employer. All such records and copies thereof, whether compiled or kept at home, or at the premises of Employer, and all samples and experimental materials, will be the exclusive property of Employer. 
  
 2. All inventions, discoveries, know-how and ideas made, conceived, discovered or developed
by Employee, solely or with others, while employed by Employer, during or after working hours, which are useful in or related to the business, work or investigations of Employer, and which have been made, conceived, discovered or developed wholly or
partially with the use of Employer’s time, material, facilities, or confidential, proprietary, business and technical information or trade secrets, belong exclusively to Employer (the “Employer Inventions”). To the extent that,
notwithstanding the foregoing sentence, Employee obtains or retains an interest in any Employer Inventions, Employee hereby irrevocably assigns and transfers to Employer (and to the extent that an executory assignment is not enforceable, Employee
hereby agrees to assign and transfer to Employer, in writing, from time to time, upon request) any right, title, or interest that Employee has or may have in such Employer Inventions under copyright, patent, trade secret and trademark law, in
perpetuity or for the longest period otherwise permitted by law without the necessity of further consideration. Employee agrees that he/she shall have no claim for additional compensation for such inventions, discoveries or ideas. 
  
 3. Employee shall promptly disclose to his/her immediate superior or other authorized person
of Employer any such invention, discovery or idea. At the request and expense of Employer, either before or after termination of Employee’s employment, Employee shall assist in acquiring and maintaining patent protection upon and confirming
Employer’s title to such inventions, discoveries and ideas. Employee’s assistance (at Employer’s sole expense) will include the signing of applications for patent, assignments and other papers, cooperating in necessary proceedings,
and taking any other steps considered desirable by Employer. 
  
 4. Employee shall
not, either during or after his/her employment, disclose any Confidential Information without the prior written consent of Employer. In general, “Confidential Information” means any information not released by Employer to the general
public, including but not limited to information relating to research, processes, products, formulas, methods, apparatus, equipment, costs, business studies, business procedures and finances and any samples and materials of Employer or any
subsidiary, affiliate, contractor, customer or licensee of Employer, and all information and materials received by the Employer or Employee from a third party subject to an obligation of confidentiality and/or non-disclosure. 
  

 5. Employee has not been debarred under the provisions of the Generic Drug Enforcement Act of 1992, including without
limitation, 21 U.S.C. Section 335a. If at any time during the term of this Agreement Employee (a) becomes debarred, or (b) receives notice of action or threat of action with respect to its debarment, Employee shall notify Employer immediately.

  
 6. During the term of Employee’s employment, Employee shall not engage in
any activity in competition with or against the best interests of Employer. 
  
 7.
There are no restrictions, agreements or understandings whatsoever to which the Employee is a party which would prevent or make unlawful the Employee’s execution of this Agreement or the Employee’s employment by Employer, or would prevent,
limit or impair in any way the performance by the Employee of the obligations hereunder. Any similar agreement with Employer previously signed by Employee is hereby superseded except with respect to obligations already incurred under any such
similar agreement. 
  
 8. Employee shall observe safety and health regulations and
report all known hazards to his/her supervisor or safety office. 
  
 9. This
Agreement is not a promise of continued employment. Employee acknowledges that either the Employee or Employer has the right to terminate Employee’s employment with Employer at any time and for any reason or no reason. 
  
 10. Upon the termination of his/her employment with Employer, Employee shall return to
Employer all originals and copies (whether in paper or electronic form) of all documents, records, notebooks, files, correspondence, reports, memoranda or similar materials that represent, contain or describe any Employer Inventions or Confidential
Information, or other materials or property of any kind belonging to Employer then in his/her possession or under his/her control, whether prepared by the Employee or by others. 
  
 11. This Agreement contains the entire agreement and understanding of the parties, and merges and supersedes all prior and contemporaneous
discussions, agreements and understandings of every nature between the parties hereto relating to the matters discussed herein. The provisions of this Agreement set forth herein shall survive the termination of the Employee’s employment with
Employer. This Agreement shall be binding upon Employee’s heirs, executors, administrators or other legal representatives. 
  

									
	 ACCEPTED AND AGREED TO:
	 	 	 	 
					
	 BY:
	 	 	 	 	 	 	 	 
	 	 	 Signature
	 	 	 	 	 	 Printed Name

			
	 VIROPHARMA INCORPORATED
	 	 	 	 
					
	 BY:

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