EX-4.73





 Exhibit 4.73 

Exclusive Equity Purchase and Transfer Option Agreement 

This Exclusive Equity Purchase and Transfer Option Agreement (this “Agreement”) is entered into by and among the following parties in
Beijing, PRC on March 31, 2018: 
 Party A:        Baidu, Inc. 

Address:        M&C Services Limited, PO Box 309, Ugland House, Grand Cayman,
KY1-1104, Cayman Islands 
 Party B:        Baidu Online Network
Technology (Beijing) Co., Ltd. 
 Address:        Baidu Building, No. 10 Shangdi 10th Street, Haidian
District, Beijing 
 Party C:        Zhixiang Liang 

ID No.: 
 Party
D:        Beijing Perusal Technology Co., Ltd. 
 Address:        A2 2/F
No. 17 Building Zhongguancun Software Park, 8 East Bei Wang Road (W), Haidian District, Beijing 
 In this Agreement, Party A, Party B, Party C and
Party D are called collectively as the “Parties” and each of them is a “Party.” 
 WHEREAS: 

1. Party A is a Cayman Islands company incorporated under the laws of Cayman Islands and an affiliate of Party B; 

2. Party B is a wholly foreign-owned enterprise incorporated under the laws of the People’s Republic of China (the “PRC”); 

3. Party D is a liability limited company incorporated in Beijing, the PRC; 

4. Party C is a shareholder of Party D, owning 50% equity interests in Party D (the “Equity Interest”); 

5. Party B and Party C entered into an Amended and Restated Loan Agreement dated June 20, 2016, whereby Party C obtains a loan up to RMB1,598,440,000 from
Party B (the “Loan Arrangement”) in connection with its acquiring 50% equity interests in Party D (the “Original Loan Agreement”). A Termination Agreement is made as of [ ], 2018 by and among Party B,
Party C, Party D and other parties thereto to terminate the Original Loan Agreement, and as of the same date thereof Party B, Party C and Party D entered into a new Loan Agreement to replace the Original Loan Agreement and set forth new rights and
obligations of each parties thereto (the “New Loan Agreement”). It is acknowledged in the New Loan Agreement that Party B continue to be the creditor of the loan of RMB1,598,440,000 provided by it to Party C; 












 6. Party B and Party D entered into a series of agreement dated June 23, 2006, including the Exclusive
Technology Consulting and Services Agreement (the “Services Agreements”), whereby Party B provides exclusive technology consulting and services to Party D; and 

7. Party B and Party C entered into an Amended and Restated Equity Pledge Agreement (the “Equity Pledge Agreement”) dated June 20,
2016, whereby Party C transfers all of the Equity Interest to Party B; and 
 8. Party A and Party C entered into a Proxy Agreement dated
[    ], 2018 (the “Proxy Agreement”), whereby Party C authorizes the entity or individual designated by Party A to exercise all voting and other rights of Party C as a shareholder at the shareholders
meeting of Party D. 
 NOW, THEREFORE, the Parties agree as follows through negotiations and to be bound hereby: 

1. Purchase and Sale of Equity Interest 
 1.1
Granting of Rights 
 Party C hereby irrevocably grants to Party A an option to purchase or cause any one or more designated persons (“Designated
Persons”) to purchase, to the extent permitted under PRC law, according to the steps determined by Party A, at the price specified in Section 1.3 of this Agreement, and at any time from Party C (the
“Transferor”), a portion or all of the equity interests held by Party C in Party D (the “Option”). No Option shall be granted to any third party other than Party A and/or the Designated Persons. Party
D hereby agrees to granting of the Option by Party C to Party A and/or the Designated Persons. For purpose of this Section 1.1 and this Agreement, “person” means any individual, corporation, joint venture, partnership, enterprise,
trust or unincorporated organization. 
 1.2 Exercise Steps 

Subject to PRC law and regulations, Party A and/or the Designated Persons may exercise the Option by issuing a written notice (the “Option
Notice”) to the Transferor, specifying the equity interest to be purchased from the Transferor (the “Purchased Equity Interest”) and the manner of such purchase. 

1.3 Purchase Price 
 1.3.1 If Party A exercises the Option, the
purchase price of the Purchased Equity Interest (“Purchase Price”) shall be equal to the actual paid-in capital paid by the Transferor for the Purchased Equity Interest, unless then
applicable PRC laws and regulations require appraisal of the Purchased Equity Interest or other restrictions on the Purchase price. 
 1.3.2 If the
applicable PRC laws require appraisal of the Purchased Equity Interest or other restrictions on the Purchase Price at the time that Party A exercises the Option, the Parties agree that the Purchase Price shall be set at the lowest price permissible
under applicable law. 

  
 2 













 1.4 Transfer of the Purchased Equity Interest 

At each exercise of the Option: 
 1.4.1 The Transferor shall, in
accordance the terms and conditions of this Agreement and the Option Notice in connection with the Purchased Equity Interest, enter into an equity transfer agreement with Party A and/or the Designated Persons (as applicable) for each transfer in the
substance and form satisfactory to Party A; 
 1.4.2 The Transferor shall execute all other requisite contracts, agreements or documents, obtain all
requisite government approvals and consents, and take all necessary actions to unconditionally transfer the valid ownership of the Purchased Equity Interest to Party A and/or the Designated Persons free of any security interest, and cause Party A
and/or the Designated Persons to be the registered owner(s) of the Purchased Equity Interest. For purpose of this Section 1.4.2 and this Agreement, “Security Interest” includes without limitation guaranty, mortgage, pledge,
third-party right or interest, any share option, right of acquisition, right of first refusal, right of set-off, ownership retention or other security arrangements; provided, however, that it
does not include any security interest arising under the Equity Pledge Agreement. 
 1.5 Payment 

Payment of the Purchase Price shall be made in the manner determined through negotiations between Party A and/or the Designated Persons and the Transferor in
accordance with then applicable laws at the exercise of the Option. The Parties hereby agree that, subject to applicable laws, Transferor shall repay to Party B any amount that is paid by Party A and/or the Designated Persons to the Transferor in
connection with the Purchased Equity Interest (which amount may be net of any tax and other fees paid by the Transferor in connection with the proposed transaction contemplated under the transfer agreement). 

2. Covenants Relating to the Equity Interest  

2.1 Covenants Relating to Party D 
 Party C and Party D hereby
covenant, in relation to Party D: 
 2.1.1 Not to supplement, amend or modify Party D’s articles of association in any way, or to increase or decrease
its registered capital, or to change its registered capital structure in any way without Party A’s prior written consent; 
 2.1.2 To maintain the
corporate existence of Party D and operate its business and deal with matters prudently and effectively according to good financial and business rules and practices; 

2.1.3 Not to sell, transfer, mortgage or otherwise dispose of, or permit any other security interest to be created on, any of Party D’s assets, business
or legal or beneficial interests in its revenue at any time after the signing of this Agreement without Party A’s prior written consent; 

  
 3 













 2.1.4 Not to incur, succeed to, guarantee or permit the existence of any liability, without Party A’s
prior written consent, except (i) liabilities arising from the normal course of business, but not arising from loans; and (ii) liabilities disclosed to Party A and approved by Party A in writing; 

2.1.5 To operate persistently all the business in the normal course of business to maintain the value of Party D’s assets, and not to commit any act or
omission that would affect its operations and asset value; 
 2.1.6 Without prior written consent by Party A, not to enter into any material agreement, other
than agreements entered into in Party D’s normal course of business (for purpose of this paragraph, an agreement will be deemed material if its value exceeds RMB500,000); 

2.1.7 Not to provide loans or credit to any person without Party A’s prior written consent; 

2.1.8 To provide all information relating to Party D’s operations and financial conditions upon the request of Party A; 

2.1.9 To purchase and maintain insurance from insurance companies accepted by Party A. The amount and category of the insurance shall be the same as those of
the insurance normally procured by companies engaged in similar businesses and possessing similar properties or assets in the area where Party D is located; 

2.1.10 Not to merge or consolidate with, or acquire or invest in, any person without Party A’s prior written consent; 

2.1.11 To promptly notify Party A of any pending or threatened suit, arbitration or administrative proceedings concerning Party D’s assets, business or
revenue; 
 2.1.12 To execute all necessary or appropriate documents, take all necessary or appropriate actions and to bring all necessary or appropriate
claims or to make all necessary and appropriate defenses against all claims in order for Party D to maintain the ownership over all its assets; 
 2.1.13 Not
to distribute dividends to Party D’s shareholders in any way without Party A’s prior written consent; provided, however, that Party D shall promptly distribute all or part of its distributable profits to its shareholders upon
Party A’s request; and 
 2.1.14 At the request of Party A, to appoint persons nominated by Party A to be executive directors of Party D. 

  
 4 













 2.2 Covenants Relating to the Transferor 

Party C hereby covenants: 
 2.2.1 Not to sell, transfer, mortgage
or otherwise dispose of, or allow any other security interest to be created on, the legal or beneficial interest in the Equity Interest at any time after the signing of this Agreement without Party A’s prior written consent, other than the
pledge created on the Transferor’s Equity Interest in accordance with the Equity Pledge Agreement; 
 2.2.2 Without Party A’s prior written
consent, not to vote for or sign any shareholders’ resolution at Party D’s shareholders’ meetings to approve the sale, transfer, mortgage or disposition in any other manner of, or the creation of any other security interest on, any
legal or beneficial interest in the Equity Interest, except to or for the benefit of Party A or its designated persons; 
 2.2.3 Without Party A’s prior
written consent, not to vote for or sign any shareholders’ resolution at Party D’s shareholders’ meetings to approve Party D’s merger or consolidation with, acquisition of or investment in, any person; 

2.2.4 To promptly notify Party A of any pending or threatened suit, arbitration or administrative proceedings concerning the Equity Interest owned by it; 

2.2.5 To execute all necessary or appropriate documents, to take all necessary or appropriate actions and to bring all necessary or appropriate claims or to
make all necessary and appropriate defenses against all claims in order to maintain his ownership over the Equity Interest; 
 2.2.6 At the request of Party
A, to appoint persons nominated by Party A to be executive directors of Party D; 
 2.2.7 At any time upon the request of Party A, to transfer its Equity
Interest immediately and unconditionally to the representative designated by Party A, and waive its preemptive right with respect to the transfer of equity interest by the other shareholder of Party D; 

2.2.8 To fully comply with the provisions of this Agreement and the other agreements entered into jointly or respectively by and among the Transferor, Party D
and Party A, perform all obligations under these agreements and not commit any act or omission that would affect the validity and enforceability of these agreements; and 

2.2.9 To transfer to Party A all dividends and any other form of profit distributed to it by Party D. 

2.3 Covenants Relating to Party A 
 Party A hereby covenants: 

2.3.1 If Party D needs any loan or other capital support in its business, under acceptable and reasonable scope, Party A shall provide such capital support
without imposing any condition or restriction; and 
 2.3.2 If Party D cannot repay the loan from Party A as loss incurred and has sufficient evidence to
prove, Party A agrees that it will unconditionally give up its right to require Party D to repay the loan. 

  
 5 













 3. Representations and Warranties 

As of the date of this Agreement and each transfer date, each of the Transferor and Party D hereby represents and warrants to Party A as follows: 

3.1 It has the power and authority to execute and deliver this Agreement, and any equity transfer agreement (the “Transfer Agreement”)
to which it is a party for each transfer of the Purchased Equity under this Agreement and to perform its obligations under this Agreement and any Transfer Agreement. Once executed, this Agreement and any Transfer Agreement to which it is party will
constitute a legal, valid and binding obligation of it enforceable against it in accordance with its terms; 
 3.2 The execution, delivery and performance of
this Agreement or any Transfer Agreement by it will not: (i) violate any relevant PRC laws and regulations; (ii) conflict with its articles of association or other organizational documents; (iii) violate or constitute a default under
any contract or instrument to which it is party or that binds upon it; (iv) violate any condition for the grant and/or continued effectiveness of any permit or approval granted to it; or (v) cause any permit or approval granted to it to be
suspended, cancelled or attached with additional conditions; 
 3.3 Party D has good and marketable ownership of all of its assets and has not created any
security interest on the said assets; 
 3.4 Party D has no outstanding liabilities, except (i) liabilities arising in its normal course of business;
and (ii) liabilities disclosed to Party A and approved by Party A in writing; 
 3.5 There are currently no existing, pending or threatened litigations,
arbitrations or administrative proceedings related to the Equity Interest, Party D’s assets or Party D; and 
 3.6 The Transferor has good and
marketable ownership interest in the Equity Interest and has not created any security interest on such Equity Interest, other than the security interest pursuant to the Equity Pledge Agreement and the restrictions provided under the Proxy Agreement
and hereunder. 
 4. Assignment of Agreement 

4.1 Neither Party C or Party D may assign its rights and obligations under this Agreement to any third party without the prior written consent of Party A. 

4.2 Party C and Party D hereby agree that Party A may assign all its rights and obligation under this Agreement to a third party as Party A sees fit, in which
case Party A only needs to give a written notice to Party C and Party D and no further consent of Party C or Party D is required. 

  
 6 













 5. Effectiveness and Term 

5.1 This Agreement shall be effective as of the date first set forth above and expire when all Equity Interest held by Party B is transferred to Party A and/or
Designated Persons in accordance with this Agreement. 
 5.2 If the duration of operation (including any extension thereof) of Party A or Party D is expired
or terminated for other reasons within the term set forth in Section 5.1, this Agreement shall be terminated simultaneously, except in the situation where Party A has assigned its rights and obligations in accordance with Section 4.2
hereof. 
 6. Applicable Law and Dispute Resolution 

6.1 Applicable Law 
 The formation, validity, interpretation and
performance of and resolution of any dispute arising from this Agreement shall be protected and governed by the laws of the PRC. 
 6.2 Dispute Resolution

 Any dispute arising in connection with the interpretation and performance of the provisions of this Agreement shall be resolved by the Parties in good
faith through negotiations. In case no resolution can be reached by the Parties within thirty (30) days after either party makes a request for dispute resolution through negotiations, either party may refer such dispute to China International
Economic and Trade Arbitration Commission (“CIETAC”) for arbitration in accordance with CIETAC’s arbitration rules then in effect. The seat of arbitration shall be Beijing and language of proceedings shall be Chinese. The arbitral
award shall be final and binding upon the Parties. 
 7. Taxes and Expenses 

Every Party shall, in accordance with PRC laws, bear any and all transfer and registration taxes, expenses and charges incurred by or levied on it with respect
to the preparation and execution of this Agreement and each Transfer Agreement and the consummation of the transactions contemplated under this Agreement and each Transfer Agreement. 

8. Notices 
 Any notice or other communication
forms which is given by the parties hereto shall be in Chinese and delivered personally to the addresses listed as below or the addresses designated by the Parties. The notice time which is deemed as the time when the notice actually reaches the
addressee follows: (a) the notice time of the notice delivered personally shall be the day when the person conducts the delivery; (b) the notice time of the notice delivered as mail shall be the tenth (10th) day following the mailing date of the registered mail by air (marked by seal) or shall be the fourth (4th) day following the day handing to
internally recognized delivery services organizations; (c) the notice time of the notice delivered by facsimile shall be the acceptance time on the delivery confirmation; and (d) on the day of successful delivery if it is delivered by
electronic mail evidenced by the confirmation generated from the mail delivery system or without receipt of delivery failure or return message from the mail delivery system within 24 hours. 

  
 7 














			
	Party A:	  	Baidu, Inc.
	Address:	  	M&C Services Limited, PO Box 309, Ugland House, Grand Cayman, KY1-1104, Cayman Islands
	Attention:	  	Yanhong Li
	Facsimile:	  	
	Telephone:	  	
		
	Party B:	  	Baidu Online Network Technology (Beijing) Co., Ltd.
	Address:	  	3/F, Baidu Building, No. 10 Shangdi 10th Street, Haidian District, Beijing
	Facsimile:	  	
	Telephone:	  	
		
	Party C:	  	Zhixiang Liang
	Address:	  	
	Facsimile:	  	
	Telephone:	  	
		
	Party C:	  	Beijing Perusal Technology Co., Ltd.
	Address:	  	A2 2/F No. 17 Building Zhongguancun Software Park, 8 East Bei Wang Road (W), Haidian District, Beijing
	Facsimile:	  	
	Telephone:	  	

 9. Confidentiality 

The Parties acknowledge and confirm any oral or written materials exchanged by the Parties in connection with this Agreement are confidential. The Parties
shall maintain the confidentiality of all such materials. Without the written approval by the other Parties, any Party shall not disclose to any third party any relevant materials, but the following circumstances shall be excluded: 

 

	 	a.	 Materials that are or will become known by the public (through no fault of the receiving party);



  

	 	b.	 Materials required to be disclosed by the applicable laws or rules of the stock exchange; and



  

	 	c.	 Materials disclosed by each Party to its legal or financial advisors relating the transactions contemplated by
this Agreement, and such legal or financial advisors shall comply with the confidentiality provisions similar to this article. 


 The
disclosure of information by the staff or consultants of any party shall be deemed as disclosure by the party itself. This Article 9 shall survive any invalidity, termination, expiration or unenforceability of this Agreement. 

  
 8 













 10. Further Assurances 

The Parties agree to promptly execute documents and take further actions that are reasonably required for, or beneficial to, the purpose of performing the
provisions and carrying out the intent of this Agreement. 
 11. Breach Liabilities 

11.1 Party A shall have the right to terminate this Agreement and/or hold Party C or Party D liable for any damages if Party C or Party D is in material breach
of any provision under this Agreement. This Section 11.1 shall not be prejudicial to any other right of Party A under this Agreement. 
 11.2 Unless
otherwise legally required, neither Party C or Party D may terminate or otherwise end this Agreement under any circumstance. 
 12.
Miscellaneous 
 12.1 Amendment, Modification or Supplement 

Any amendment or supplement to this Agreement shall be made by the Parties in writing. The amendments or supplements duly executed by each Party shall be
deemed as a part of this Agreement and shall have the same legal effect as this Agreement. 
 12.2 Entire Agreement 

Notwithstanding Article 5 of this Agreement, the Parties acknowledge that once this Agreement becomes effective, it shall constitute the entire agreements of
the Parties with respect to the subject matters hereof and shall supersede all prior oral and/or written agreements and understandings by the Parties with respect to the subject matters hereof. 

12.3 Severability 
 If any provision of this Agreement is judged
to be invalid, illegal or unenforceable in any respect according to any applicable law or regulation, the validity, legality and enforceability of the other provisions hereof shall not be affected or impaired in any way. The Parties shall, through
good-faith negotiations, replace those invalid, illegal or unenforceable provisions with valid provisions that may bring about economic effects as similar as possible to those from such invalid, illegal or unenforceable provisions. 

12.4 Headings 
 The headings contained in this Agreement are for
the convenience of reference only and shall not be used for the interpretation or explanation or otherwise affect the meaning of the provisions of this Agreement. 

  
 9 













 12.5 Language and counterparts 

This Agreement is executed in Chinese in four originals; each Party holds one original and each original has the same legal effect. 

12.6 Successor 
 This Agreement shall bind upon and inure to the
benefit of the successors and permitted assigns of each Party. 
 12.7 Survival 

Any obligation arising from or becoming due under this Agreement before its expiration or premature termination shall survive such expiration or early
termination. Articles 6, 8 and 9 and this Section 12.7 shall survive the termination of this Agreement. 
 12.8 Waiver 

Any Party may waive the terms and conditions of this Agreement by a written instrument signed by the Parties. Any waiver by a Party to a breach by the other
Parties in a specific situation shall not be construed as a waiver to any similar breach by the other Parties in other situations. 
 (No text below) 

  
 10 













 (Signature page) 

IN WITNESS WHEREOF, each Party has executed or caused this Agreement to be executed by its legal or authorized representative on its behalf as of the
date first written above. 
  

					
	Party A:	  		  	
			
	Baidu, Inc.	  		  	
			
	Signature:	  	 /s/ Yanhong Li
	  	
	Title:	  	Director	  	
			
	Party B:	  		  	
	
	Baidu Online Network Technology (Beijing) Co., Ltd. (seal)
			
	Signature:	  	 /s/ Hailong Xiang
	  	
	Title:	  	Legal Representative	  	
			
	Party C:	  		  	
		
	Zhixiang Liang	  	
			
	Signature:	  	 /s/ Zhixiang Liang
	  	
			
	Party D:	  		  	
		
	Beijing Perusal Technology Co., Ltd. (seal)	  	
			
	Signature:	  	 /s/ Hailong Xiang
	  	
	Title:	  	Legal Representative	  	


  
 11