Citizens of Schengen states can stay in the Czech Republic up to three months in any half-year without any special permits but will need a visa if they intend to stay longer than three months / Citizens of the United States, Canada, Australia and of EU and the European Economic Area member states do not need a visa to enter the Czech Republic. Visitors from these countries can stay in the Czech Republic up to three months in any half-year without a residence permit.
For more details please consult: http://www.mzv.cz/jnp/en/information_for_aliens/general_visa_information/

Nationals of the EU/EEA Member States and Switzerland are able to work without restriction in Czech Republic. Their employer, however, is obligated to report start of employment to the local labour office.
If the employee intends to stay longer than 90 days, he/she is obliged to report thier place of residency to the department of foreign police up to 30 days after arrival. 
Citizens of  the so called third countries (not a citizen of EU or Iceland, Lichtenstein, Norway a Switzerland) may obtain an Employee Card, which is a permit for long-term residence and employment at the same time.
A foreigner who has an Employee Card issued for a specific job is entitled to reside in the Czech Republic and work in a job for which the green card was issued.
More information: http://www.mvcr.cz/mvcren/article/employee-card-682810.aspx

There is no central authority which issues filming permits at the national level in the Czech Republic. Film permits are issued by municipal authorities and other local administrative bodies. Fees, deadlines and other requirements vary, depending on the location. Filmmakers shooting on private property must also deal directly with the property owners.

Accepts ATA Carnets for Commercial Samples, Exhibitions and Fairs, Professional Equipment. For detailed information visit http://www.komora.cz/

VAT standard rate is 21% (since 2013). Reduced Rate 15% : food, non-alcoholic drinks, provision of water and heating, accommodation, public transport. There is also an additional reduced tax of 10% on books and pharmaceuticals.

On 20.06.1996, the Parliament of the Czech Republic approved a new consolidated version of Czech copyright law (Law no.175 of 20.06.1996 on Literary, Scientific and Artistic Works). This law revises all copyright law in the Czech Republic, which had for a long time been based on the Law on literary, scientific and artistic works no. 35 of 25.03.1965, which was frequently amended, most recently by Law no. 237 of 27.09.1995 (as reported in IRIS no. 4/1996, p. 9). The Law is divided into various sections, the first covering authors' rights, the second the rights of performing artists, and the fourth (the third has been dropped) the rights of producers of recordings and broadcasting operators; the fifth section contains final provisions. According to Section 1, the Law applies not only to literary, dramatic, musical, architectural and art works, but also to film works and computer programs. The protection of copyright is informal - no formal requisites need to be fulfilled to obtain protection, because copyright exists from the moment, when the work is expressed in any objectively perceivable manner. Ref: Law No. 121/2000 Coll. of 7 April 2000 on Copyright, Rights Related to Copyright and on the Amendment of Certain Laws (Copyright Act) (http://www.wipo.int/wipolex/en/details.jsp?id=962)

The social security contribution is 8% for the employee (28% for freelance) and 26% for the employer.