Answering strictly as the question is worded - - provided there was no intent to deceive or defraud, it is legal. Two elements must be present to form a crime - (1) a criminal act done with (2) a criminal intent. If your intent was not 'criminal' it may be questionable, but it is not illegal.
A fraudulent signature is often referred to as a forged signature or a counterfeit signature. This occurs when someone signs a document using another person's name without their authorization or consent, which is illegal and unethical.
That is illegal.
No, it is not illegal to change your signature as long as you are not doing it with fraudulent intent. It is common for people to update or modify their signatures over time.
"Illegal" is against or contrary to the law. In the context of the question the document or note is not contrary to any known law-but it can be argued that its legitimacy is null and void-similar to a cheque without a valid signature or valid date. The document is therefore "alegal" but by no means, illegal.
What is contained on the "back page?" Customarily the Notary signs and affixes their seal on the signature page of the document since the signatures are what they are actually witnessing.
It's illegal to forge anyone's signature on any kind of document.
No, you can put an X or an arrow or a little sticky tag that says "Sign Here" or any other indication that a signature is required. If you're asking if the "X" mark constitutes a valid signature, the answer is "probably", but only if it was made with the intent to be a signature on the document.
No, this would be illegal, and would defeat the purpose of the signature. This is because the whole point of the signature is for you to give consent that you agree with these new rules
Depends on the intensity of the faked document. If you fake property related documents you might probably be jailed. It also depends on how high-profile the document is and you are. A lot of public embarrassment could follow when you are found out. Fraud is illegal, and there can be big penalties. If you claim an academic degree you don't really have, and then you end up as superintendent of schools and someone looks up your record, you are going to be publicly humilated all over the newspapers and forced to resign. This happened in my city. If you forge a potentially valuable document and try to sell it, you're a criminal.
The full definition of a fake passport would be an illegal document copied or modified by people that are not authorized to create those types or any types of documents.
No.
Forgery is illegal everywhere. "Faking" a note from someone is forgery. Your employer might not fire you if you have done it once, but many employers will fire you immediately if they find you have forged someone else's signature onto any document.