100!

Weird... I registered the copyright 2 days ago. How does that work out?

yep. copyright does not need to be applied for like a trademark or patent.

Copyright protection subsists from the time the work is created in fixed form. The copyright in the work of authorship immediately becomes the property of the author who created the work. Only the author or those deriving their rights through the author can rightfully claim copyright.

In the case of works made for hire, the employer and not the employee is considered to be the author. Section 101 of the copyright law defines a "work made for hire" as:

(1) a work prepared by an employee within the scope of his or her employment; or
(2) a work specially ordered or commissioned for use as:
a contribution to a collective work
a part of a motion picture or other audiovisual work
a translation
a supplementary work
a compilation
an instructional text
a test
answer material for a test
an atlas
if the parties expressly agree in a written instrument signed by them that the work shall be considered a work made for hire....

The authors of a joint work are co-owners of the copyright in the work, unless there is an agreement to the contrary.

Copyright in each separate contribution to a periodical or other collective work is distinct from copyright in the collective work as a whole and vests initially with the author of the contribution.


Two General Principles
Mere ownership of a book, manuscript, painting, or any other copy or phonorecord does not give the possessor the copyright. The law provides that transfer of ownership of any material object that embodies a protected work does not of itself convey any rights in the copyright.
Minors may claim copyright, but state laws may regulate the business dealings involving copyrights owned by minors. For information on relevant state laws, consult an attorney.

Copyright protects "original works of authorship" that are fixed in a tangible form of expression. The fixation need not be directly perceptible so long as it may be communicated with the aid of a machine or device. Copyrightable works include the following categories:

literary works;
musical works, including any accompanying words
dramatic works, including any accompanying music
pantomimes and choreographic works
pictorial, graphic, and sculptural works
motion pictures and other audiovisual works
sound recordings
architectural works
These categories should be viewed broadly. For example, computer programs and most "compilations" may be registered as "literary works"; maps and architectural plans may be registered as "pictorial, graphic, and sculptural works."

HOW TO SECURE A COPYRIGHT
Copyright Secured Automatically upon Creation
The way in which copyright protection is secured is frequently misunderstood. No publication or registration or other action in the Copyright Office is required to secure copyright. (See following Note.) There are, however, certain definite advantages to registration. See "Copyright Registration."

Copyright is secured automatically when the work is created, and a work is "created" when it is fixed in a copy or phonorecord for the first time. "Copies" are material objects from which a work can be read or visually perceived either directly or with the aid of a machine or device, such as books, manuscripts, sheet music, film, videotape, or microfilm. "Phonorecords" are material objects embodying fixations of sounds (excluding, by statutory definition, motion picture soundtracks), such as cassette tapes, CDs, or LPs. Thus, for example, a song (the "work") can be fixed in sheet music (" copies") or in phonograph disks (" phonorecords"), or both.

If a work is prepared over a period of time, the part of the work that is fixed on a particular date constitutes the created work as of that date.

You can get more details here