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A contract, lease, share, or other right is said to be “onerous” when the obligations attaching to it counter-balance or exceed the advantage to be derived from it, either absolutely or with reference to the particular possessor. Sweet. As used in the civil law and in the systems derived from it, (French, Scotch, Spanish, Mexican) the term also means based upon, supported by, or relating to a good and valuable consideration, i.e. one which imposes a burden or charge in return for the benefit conferred. (Black's Law Dictionary)

The presumption of good faith or bona fides is essentially a civil law concept with a long history going back to Roman law that is specifically made applicable in contract law. The term is applied to all kinds of transactions. Thus, Art. 527 of the Civil Code states: Good faith is always presumed, and upon him who alleges bad faith on the part of a possessor rests the burden of proof. (http://manilastandardtoday.com)

In law, transferability can be defined as the right for a possessor of property to transfer it to a third party with or without consideration, using the same standard of proof that he has proved he is the valid owner and that he exerted his right to transfer. (Chegg)

RETENTION, Scottish law. The right which the possessor of a movable has, of holding the same until he shall be satisfied for his claim either against such movable or the owner of it; a lien. (A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier.)