Here Sec 194J shall apply
Extract of Section
no deduction of tax shall be made on the following specified payment under section 194J of the Act, namely:-
Payment by a person (hereafter referred to as the transferee) for acquisition of software from another person, being a resident, (hereafter referred to as the transferor), where-
(i) the software is acquired in a subsequent transfer and the transferor has transferred the software without any modification,
(ii) tax has been deducted-
(a) under section 194J on payment for any previous transfer of such software; or
(b) under section 195 on payment for any previous transfer of such software from a non-resident, and
(iii) the transferee obtains a declaration from the transferor that the tax has been deducted either under sub-clause (a) or (b) of clause (ii) along with the Permanent Account Number of the transferor.
In your Case:-
TDS on Purchase of Software
1) TDS u/s 195 shall apply on payment to non resident person.
TDS on sales of Software
1) You shall give a declaration that the tax has been deducted along with your Permanent Account Number.