Good luck!

tratado m
1 (ensayo, libro) treatise
2 (acuerdo, pacto) treaty
www.wordreference.com/es/en/translation.asp?spen=tratado&v=...

suscribir verbo transitivo
1 (una propuesta, una opinión) to endorse, subscribe to
2 Fin (acciones) to subscribe for
3 frml (un acuerdo, un tratado, un contrato) to sign
www.wordreference.com/es/en/translation.asp?spen=suscribir&...

Suscribir: firmar al pie de un escrito. Aceptar la opinión o dictámen de otros.
Espero que te ayude!!!!!!!!!!

Otra:

sub·scribe (səb-skrīb') pronunciation

v., -scribed, -scrib·ing, -scribes.

v.tr.

1. To pledge or contribute (a sum of money).
2. To sign (one's name) at the end of a document.
3. To sign one's name to in attestation, testimony, or consent: subscribe a will.
4. To authorize (someone) to receive or access electronic texts or services, especially over the Internet.

v.intr.

1.
1. To contract to receive and pay for a certain number of issues of a publication, for tickets to a series of events or performances, or for a utility service, for example.
2. To receive or be allowed to access electronic texts or services by subscription.
2. To promise to pay or contribute money: subscribe to a charity.
3. To feel or express hearty approval: I subscribe to your opinion. See synonyms at assent.
4. To sign one's name.
5. To affix one's signature to a document as a witness or to show consent.
subscribe also subscribe to

verb

1. To give in common with others: chip in, contribute, donate. Informal kick in. Slang come across. See give/take/reciprocity.
2. To respond affirmatively; receive with agreement or compliance: accede, accept, acquiesce, agree, assent, consent, nod, yes. See agree/disagree.
3. To affix one's signature to: autograph, endorse, inscribe, sign, undersign. Idioms: put one's John Hancock on, set one's hand to. See law.

Legal Dictionary
sub·scribe (səb-`skrīb)
vb.

sub·scribed sub·scrib·ing[Latin subscribere, literally, to write beneath, from sub- under + scribere to write -vt]

1. To write (one's name) underneath or at the end of a document (we now subscribe our names as witnesses - W. M. McGovern, Jr. et al.)
2.
1. To sign (as a document) with one's own hand in token of consent, obligation, or attestation (such witnesses shall subscribe the will in the presence of the testator - West Virginia Code)
2. To pledge (a gift or contribution) by writing one's name with the amount
3. To sell (stock) by subscription (over two million shares have been subscribed) -vi

# To sign one's name to a document; also To give consent or approval by signing one's name
# To agree to purchase and pay for securities esp. of a new offering (a right to subscribe to a share of stock - D. Q. Posin) sub·scrib·er
n.
Español (Spanish)
v. tr. - suscribir, firmar, aprobar, ser partidario de
v. intr. - firmar, aprobar, suscribirse, aceptar