Paul reads as his own all the poems he buys.
Well, all that he pays for is his, I surmise.

[Carmina Paulus emit, recitat sua carmina Paulus.
Nam quod emas, possis iure vocare tuum.]

Martial (AD c.39-c.103) Spanish Roman poet, satirist, epigrammatist [Marcus Valerius Martialis]
Epigrams [Epigrammata], Book 2, epigram 20 (2.20) [tr. Pott & Wright (1921)]
    (Source)

Original Latin. Alternate translations:

Paul verses buys; and what he buys, recites.
Alike his own are what he buys and writes.
[tr. Elphinson (1782)]

Sly Paul buys verse as he buys merchandise,
Then for his own he'll pompously recite it --
Paul scorns a lie -- the poetry is his --
By law his own, although he could not write it.
[tr. New Monthly Magazine (1825)]

Paulus buys verses; Paulus recites his own verses. And they are his own, for that which you buy, you have a right to call yours.
[tr. Amos (1858), 2.32]

Paullus buys poems, and aloud,
As his, recites them to the crowd.
For what you buy it is well known
You have a right to call your own.
[tr. Webb (1879)]

Paulus buys verses: Paulus recites his own verses; and what you buy you may legally call your own.
[tr. Bohn's Classical (1897)]

Paulus buys a book of verse
And reads us then his own.
One's right, of course, to what one buys
Can legally be shown.
[tr. Nixon (1911)]

Paul buys up poems, and to your surprise,
Paul then recites them as his own:
And Paul is right; for what a person buys
Is his, as can by law be shown!
[tr. Duff (1929)]

Paulus buys poems; Paulus gives readings from his poems.
After all, what you buy you can rightfully call your own.
[tr. Williams (2004)]

A poet's name is what you sought.
The name, you found, is all you bought.
[tr. Wills (2007)]

Bought verses for his own Paul doth recite,
For what you buy you may call yours by right.
[tr. Wright]

Paulus buys verse, recites, and owns them all,
For what thou buy'st, thou may'st thine truly call.
[tr. Fletcher]