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I think it was the config file in which there is a line, that you can change. A few years ago I did that, but I can't remember where it was exactly.
 
Thanks, but I don't find it :(

I'm thinking it's in the misc. file since that's where you can make changes to who you can trade blue prints to.
 
Pasha is right. Here it is in misc:

(just use find)

# If owned (!) provinces can be sold/transferred to non-allied countries. 0 = No, 1 = Yes (player could offer such provinces), 2 = Yes (player cold offer and ask for such provinces)
0 #0
# Allow non-owned (just controlled) provinces to be transferred to allied(!) countries if provinces are cores for that ally. 1 - Enabled, 0 - Disabled (default):
0 #0
 
Pasha is right. Here it is in misc:

(just use find)

# If owned (!) provinces can be sold/transferred to non-allied countries. 0 = No, 1 = Yes (player could offer such provinces), 2 = Yes (player cold offer and ask for such provinces)
0 #0
# Allow non-owned (just controlled) provinces to be transferred to allied(!) countries if provinces are cores for that ally. 1 - Enabled, 0 - Disabled (default):
0 #0

Oh! Great! Thanks a lot! I searched in the file but I didn't find the line :D
 
Pasha is right. Here it is in misc:

(just use find)

# If owned (!) provinces can be sold/transferred to non-allied countries. 0 = No, 1 = Yes (player could offer such provinces), 2 = Yes (player cold offer and ask for such provinces)
0 #0
# Allow non-owned (just controlled) provinces to be transferred to allied(!) countries if provinces are cores for that ally. 1 - Enabled, 0 - Disabled (default):
0 #0

Sorry for my ignorance, but I have to change the "0" valor or the "#0" valor?
 
It's the first number, actually.

If you want to trade provinces without restrictions, you need to change it to this.

# If owned (!) provinces can be sold/transferred to non-allied countries. 0 = No, 1 = Yes (player could offer such provinces), 2 = Yes (player cold offer and ask for such provinces)
2 #0
# Allow non-owned (just controlled) provinces to be transferred to allied(!) countries if provinces are cores for that ally. 1 - Enabled, 0 - Disabled (default):
1 #0
 
The second one, if I remember correctly.
It's the first number, actually.

If you want to trade provinces without restrictions, you need to change it to this.

# If owned (!) provinces can be sold/transferred to non-allied countries. 0 = No, 1 = Yes (player could offer such provinces), 2 = Yes (player cold offer and ask for such provinces)
2 #0
# Allow non-owned (just controlled) provinces to be transferred to allied(!) countries if provinces are cores for that ally. 1 - Enabled, 0 - Disabled (default):
1 #0

Thank you all!