A company registration number is a unique number issued by Companies House when a limited company or Limited Liability Partnership (LLP) is incorporated. It is usually abbreviated as 'CRN' and sometimes referred to as a Companies House Number. Your CRN will consist of 8 numbers, or 2 letters followed by 6 numbers.

TRADEMARK

A trademark, trade mark, or trade-mark  is a recognizable sign, design, or expression which identifies products or services of a particular source from those of others,  although trademarks used to identify services are usually called service marks. The trademark owner can be an individual, business organization, or any legal entity. A trademark may be located on a package, a label, a voucher, or on the product itself. For the sake of corporate identity, trademarks are often displayed on company buildings.

Advantages
Securing a registered trademark protects your brand, and provides you with the tools to prevent someone using similar signs and riding off the back of your business. If you do not protect your trademark by registering it, then you may find you are legally prevented from expanding your business.

Copyrights

The exclusive and assignable legal right, given to the originator for a fixed number of years, to
print, publish, perform, film, or record literary, artistic, or musical material.
what types of things are protected by copyright?
Here’s a quick overview.

(1) Literary works.
(2) Musical works.
(3) Dramatic works.
(4) Choreographic works.
(5) Pictorial, graphic, and sculptural works.
(6) Motion pictures and other audiovisual works.
(7) Sound recordings.
(8) Architectural work.

Patents 

Limited legal monopoly granted to an individual or firm to make, use, and sell its invention, and to exclude others from doing so. An invention is patentable if it is novel, useful, and non-obvious. To receive a patent, a patent application must disclose all details of the invention so that others can use it to further advance the technology with new inventions.
in most of the world, patents are granted on the 'first to apply' basis, with a protection period of 7 years (India) to 20 years (European Union). In the US, they are granted for 17 years on the 'first to invent' basis. Responsibility of identifying, locating, and suing the patent violators, however, rests solely with the patent holder; patent law provides only means of prosecution and determination of just compensation.

Patentable items fall under four classes

1. Machine: apparatus or device with interrelated parts that work together to perform the invention's designed or intended functions.
2. Manufacture: all manufactured or fabricated items.
3. Process: chemical, mechanical, electrical or other process that produces a chemical or physical change in the condition or character of an item and Composition of matter: chemical compounds or mixtures having properties different from their constituent ingredients.