Languages cannot be owned unless they are invented by a single company or individual and have been copyrighted or parented by some means, and even then, the copyright or patent would have dubious validity as the concept of owning a language does not exist in any established country. Programming languages are something else entirely and I won't go into the details of that.
Language standardisation doesn't occur in every country or with every language, but regardless the organisation that standardises a particular language can do so by law or by the fact that they're simply the only major group attempting to do it.
An example of the former would be how the Japanese Ministry of Education standardises Japanese in a de jure fashion; literally, the Ministry of Education has authority of the language, what is considered a word, what is not, the kana, kanji and kanji compounds, particles, et al under Japanese law. Within Japan, its policies and ideas of the language are thus legally enforcable. Outside of the country, this standard is de facto, there's no legal bodies stating that the Japanese Ministry of Education has legal basis to standardise the Japanese language, however, most rational, logical people who study Japanese would study Japanese as it is standardised in the country in which it is most commonly spoken (Japan), in this case, as it is standardised by the Ministry of Education, so as a result, the Ministry of Education's standard of the Japanese Language is de jure within the nation and de facto outside of it.
Some oral languages, such as English, French, Spanish and German, are widely-used all over the world and one would have to ask how they could be standardised. Well, many of them are standardised, but the standard is not generally followed by people in other nations. England may have its own organisation to standardise English, but there would be another one in the US, another in Australia, yet another in Canada, and so on. All of these different organisations would have differening opinions as to how the language should be standardised, and thus there would be no prevailing idea as to which should be considered correct.
Visual languages (sign languages, for example) have a different situation additionally as they're not only often used all over the world (BSL and LSF derivatives have been exported all over the place), but they're also not considered acceptable by the government for public use, only for deaf people. This is, of course, a different problem entirely, but nonetheless as a result of this generally there would be no governmental organisation, ministry or department seeking to standardise a particular visual language. As a corrolary of this, a particular visual language is generally standardised as much as possible by private organisations. I'm really not sure if ASL is being standardised very much any more in the US as it's pretty portable the way it is. I imagine the National Association of the Deaf (NAD) would be overseeing any such efforts, though. I imagine a similar organisation in France would be standardising LSF, ASL's parent, and that another similar organisation in England would be standardising BSL specifically.